Flexible conduit or tube.



. No. 706,076. Patented Aug. 5, I902. a. A. LuTz-.

FLEXIBLE GONDUIT 0R TUBE.

(Application filed Nov. 20, 1901.)

(I0 moi.)

WITNESSES: I I E/NV'EN-TOH I fiwf' z/r w wfl I BY ATTORNEY NITED STATES} PATENT OFFICE.

GEORGE A. LUTZ, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO THOMAS E. QUINN, OF NEW YORK, N. Y.

FLEXIBLE CONDUIT OR TUBE.

SPECIFICATION forming part of Letters Patent No. 706,076, dated August 5, 1902. Application filed November 20,1901. Serial No. 82,981. (No model.)

To aZZ whom it may-concern: Y 1 thus being on the inner side. The strip so Beit known that I, GEORGE A. LUTZ, aciti- .formed is then Wound spirally, so that the zen of the United States, and a resident of groove or depression on one side of the cen- New York city, borough of Brooklyn, State of tral or median line laps the groove 01' depres- 5 New York, have invented certain new and sion on the opposite side of the median line useful Improvements in Flexible Conduits or of the adjacent spiral Winding, whereby the Tubes, of which the following is a specificaopposed sides or edges of the strip become intion. tGI'lOCkQd, as clearly shown in Fig. 2. To ao- The object of my invention is to provide a complish this overlappingand interlocking of to flexible conduit or tube particularly adapted the opposed sides of the strip,the windings are to contain electrical conductors, wherein the made comparatively close, whereby throughconduit or tube may be bent around corners out most of the length of the conduit or tube or angles or as may be desired, and in carrythe walls of the same are of substantially douing out'my invention I take a single strip of ble the thickness of the strip itself.

15 flexible material, such as metal, and on op- The overlappinginterlocking sides or edges posite sides of the longitudinal center or meof the single strip-1 serve to prevent undue dian line thereof I provide grooves or depreslengthwise elongation or stretching of the sions, preferably of a concavo-convex form in conduit or tube and yet permit the same to cross-section, and wind such strip spirally, be bent laterally to pass around corners and 20 so that the groove or depression on one side angles and to follow other lines, while at the of the median line of the strip will register same time the corresponding sides or edges with or lap the groove or depression on the of the strip remain overlapped and interopposite side of the median line of an adjalooked, as the grooved sides of the strip are cent spiral winding, whereby the interlocked enabled to slide relatively for a shortdistance 2 5 grooves or depressions will serve to prevent one upon the other. undue lengthwise elongation of the conduit Myimproved conduit or tubeis particularly or tube, while at the same time will permit adapted to contain one or more electrical conthe latter to flex or bend laterally, so thatductors, and the conduit is strong and serconductors may be carried therethrough atviceable and comparatively cheap to manu- 30 different angles and around corners. a facture. Furthermore, it will be observed Reference is to be had to the accompanying that the bore of the conduit or tube presents drawings, forming part hereof, whereina smooth surface to the passage of a conduc- Figure 1 is aside view of a conduit or tube tor capable of being drawn therethrough, as embodying my improvements. Fig. 2 is a lonno sharp edges extend in such position as to 35 gitudinal section thereof, and Fig. 3 is a crossencounter and injure the insulation upon section on the line 3 3 in Fig. 1. such conductor.-

In the accompanying drawings, in which lVhile I have shown a single groove or desimilar numerals of reference indicate correpression on each side of the central or mesponding parts in the several views, the nudian line of the single strip, it will be under- 40 meral lindicatesafiexible strip, preferably of stood that myinvention is not limited to such suitable metal, adapted to be wound spirally, an arrangement, as the strip could have more and on the opposite sides of the longitudinal than two grooves or depressions adapted to center or median line of such strip the same is interlock when the stripis wound spirally. provided with grooves or depressions 1 1 Having now described my invention, what 45 which preferably extend longitudinally along I claim isthe strip side by side. In Figs. 1 and 2 the 1. A conduit or tube of the character degrooves or depressions are shown as simiscribed comprising a spirally wound strip larly arranged-that is to say, said grooves or having grooves or depressions on opposite depressions have concave surfaces exposed sides of the central or median line, the groove 50 outwardly,the corresponding convex surfaces or depression of one convolution on one side I00 of the strip lapping and interlocking with the groove or depression on the opposite side of the strip of the next convolution, substantially as described.

2. A conduit or tube of the character described comprising a spirally-Wound strip having longitiidinally-extending grooves or depressions, the groove or depression on one side of the strip lapping and interlocking with the groove or depression on the opposite side of the strip, substantially as described.

3. A conduit or tube of the character described comprising a spirally-wound strip having similarly-disposed grooves or depressions on opposite sides of the central or median line, the groove or depression on one side of the strip lapping and interlocking with a GEO. A. LUTZ.

Witnesses:

M. lwarnwnve, T. F. BOURNE. 

